BA 478 then QR 4704 at Barcelona
London Heathrow → Barcelona → Porto
Timetable, Barcelona time
12:40BA 478 from London Heathrow at the gate
08:35QR 4704 to Porto leaves the gate
19 h 55 apart on the timetable, overnight
QR 4704 leaves 19 h 55 after BA 478 arrives on the timetable: more than half a day, so not a connection we count.